EP3247985B1 - Verbesserungen an drehmomentsensoren - Google Patents

Verbesserungen an drehmomentsensoren Download PDF

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Publication number
EP3247985B1
EP3247985B1 EP16701847.2A EP16701847A EP3247985B1 EP 3247985 B1 EP3247985 B1 EP 3247985B1 EP 16701847 A EP16701847 A EP 16701847A EP 3247985 B1 EP3247985 B1 EP 3247985B1
Authority
EP
European Patent Office
Prior art keywords
shaft
torque sensor
connecting element
sleeve
torque
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16701847.2A
Other languages
English (en)
French (fr)
Other versions
EP3247985A1 (de
Inventor
Robert Hill
Andrew Paul Smith
James Stephen IRONSIDE
Matthew LARNER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF Automotive UK Ltd
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ZF Automotive UK Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of EP3247985A1 publication Critical patent/EP3247985A1/de
Application granted granted Critical
Publication of EP3247985B1 publication Critical patent/EP3247985B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
    • B62D6/08—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque
    • B62D6/10—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque characterised by means for sensing or determining torque
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0403—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
    • G01L3/101—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
    • G01L3/101—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means
    • G01L3/102—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means involving magnetostrictive means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
    • G01L3/101—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means
    • G01L3/105—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means involving inductive means

Definitions

  • This invention relates to improvements in torque sensors, particularly for use in electric power assisted steering systems. It also relates to an electrically assisted power steering system that incorporates a torque sensor.
  • an electric motor applies a torque to the steering that assists the driver in turning the wheel.
  • a typical column drive system this comprises a steering column shaft that is supported within a shroud.
  • the shaft is connected to the steering wheel at one end and engages a gearbox at the other.
  • the gearbox connects the shaft to an electric motor and also to the steered wheels of the vehicle.
  • the electric motor is driven by a suitable drive circuit to apply the torque, and the drive circuit responds to a torque demand signal produced by a controller.
  • a torque sensor is provided which measures the torque applied to the column shaft by the driver, or measures the torque at some other point in the system depending on the type of system produced. This torque measurement is fed into the controller and used as the basis for producing the torque demand signal. Generally speaking the higher the measured torque, the larger the value of the assistance torque.
  • the assistance torque applied by the motor can also vary as a function of vehicle speed or other vehicle operating parameters. Indeed the motor can also be used to apply other torques that may be helpful in controlling the vehicle.
  • torque sensors are available but commonly a torque sensor is used that works by measuring the differential angular displacement between the two ends of a torsion bar that is connected in line between the column shaft and the gearbox.
  • the angular displacement can be measured using a range of different sensors, with magnetic or inductive type sensors being commonplace due to their relatively low production cost. As the sensors are well known they will not be described here in detail.
  • the torque sensor is generally housed within the gearbox. By securing the motor to the gearbox housing all of the electric assistance parts of the steering system can be manufactured as a single compact unit.
  • the torsion bar provides a mechanical link between the steering wheel and road wheels. To prevent damage to the torsion bar in the event that excessive torsional loads are applied (perhaps when the vehicle road wheels hit an obstacle at speed) it is known to provide drive dogs that engage to limit the amount of twist that the torsion bar will experience. This also provides a continued mechanical connection in the very unlikely event that the torsion bar fails, albeit that there will be some free play present.
  • DE 42 07 668 A1 discloses a torque sensor that senses axial movement of a control sleeve for a hydraulic steering system.
  • the sleeve is secured to the rotor by diametrically opposed pins which are movable in angled passages.
  • the invention provides a torque sensor for use in an electric power assisted steering system comprising:
  • the connecting element may comprise a pin, which may comprise an elongate element having a generally circular cross section along all or most of its length. It may be tapered from both ends towards the centre, giving a barrel like shape, tapered from one end to the other, or of generally uniform diameter along all or most of its length.
  • the connecting element may include one or more circumferential grooves at spaced locations along its length which may assist the connecting element in gripping onto the bore into which it is fixed.
  • the feature that the connecting element projects into may comprise an oversized bore into which a portion of the connecting element extends.
  • the feature may comprise a slot that extends tangentially across an inner face of the sleeve or an outer face of the second shaft.
  • the feature may comprise an oversized bore that the connecting element projects into.
  • the feature where it is a bore, may extend in a plane that is orthogonal to the axis of the torsion bar, and most preferably extend radially into or away from the axis of the torsion bar.
  • the connecting element may be a press fit into the bore into which it is secured, such as an interference fit. This ensures it will not fall out of the bore whilst requiring no adhesive or other fixings to hold it in place. It may be secured in the other manners, for example a threaded engagement.
  • one part of the connecting element is secured in a bore in the sleeve and another part plunges into a feature in the form of an oversized bore in the second shaft.
  • Each bore may extend radially towards the axis of the shafts.
  • This provides for a simple assembly as the connecting element may be easily driven down into the bore in the outer shaft until it is plunged into the bore in the inner shaft.
  • the end of the connecting element may be flush with the adjacent outer surface of the second shaft when in a position of use, or recessed into the second shaft or may stand slightly proud.
  • the connecting element may be a press fit in a bore in the second shaft and a part of the connecting element may be located within an oversized bore in the sleeve.
  • one part of the connecting element may be secured in a bore in the sleeve and another part plunges into a feature in the form of a slot that extends linearly across a part of the circumference of the second shaft. This may be formed by drilling away part of the second shaft using a drill bit that extends perpendicular to the axis of the second shaft and is spaced radially away from the axis.
  • the base of the slot may be a curved, turned, groove rather than a linear slot.
  • the connecting element may be press fitted into the sleeve and project loosely into the groove.
  • the drive dogs comprise flats formed into the outer face of the second shaft and flats formed into the inner face of the sleeve, the flats in the rest position facing each other but spaced apart and when an excess torque is applied the flats contacting to prevent excess relative rotation.
  • the first shaft, second shaft and torsion bar may all share a common axis.
  • the first shaft may comprise an output shaft and the second shaft an input shaft, the angular deflection indicating means indicating the torque applied from the input shaft to the output shaft.
  • the input shaft maybe connected to a steering wheel of a vehicle through a steering column shaft, and the output shaft to the road wheels through a further part of the steering gear.
  • the torque sensor may be located within a housing of a gearbox.
  • the gearbox housing may also support an electric motor that has a rotor that connects to the output shaft of the torque sensor through a gearset within the gearbox housing.
  • the sleeve may comprise a generally cylindrical tube that fits around the torsion bar. It may be an integral part of the first shaft, for instance being formed by hollowing out the end of the first shaft to form a bore into which the torsion bar is received. In this case, the end of the second shaft may be splined to engage corresponding splines at the bottom of the bore.
  • the sleeve may be a separate component secured to the first shaft by a suitable connector assembly so that it does not rotate axially relative to the first shaft.
  • the sleeve need not completely surround the torsion bar. It may, for example, be one or more elongate fingers that project axially from the first shaft to a position overlapping the second shaft.
  • the first and second shafts may be provided with axially extending splines extending around an end portion furthest from the torsion bar to permit connection of the torque sensor to one or more shafts along which torque is to be applied.
  • the rigid connection may be by virtue of the shaft and output connector part being integrally formed, or by otherwise being securely connected.
  • the torque sensor may include processing means that determines the torque from the output of the angular deflection means.
  • the angular deflection indicating means may comprise one or more angular position sensors that measure the angular position of at least one of the first shaft, the second shaft or the angular deflection of the input shaft relative to the second shaft.
  • the invention provides an electric power assisted steering system comprising a steering column shaft, a gearbox, an electric motor that is connected to the steering column shaft through the gearbox, a torque sensor according to the first aspect of the invention arranged so that one of the first and second shafts of the torque sensor is connected to the gearbox and the other to the steering column shaft, and a processing circuit that receives the output of the torque sensor and derives from that output a torque demand signal indicative of an assistance torque to be applied through the gearbox by the electric motor, the assistance torque acting in the same sense as the driver applied torque to reduce the effort needed to operate the steering.
  • the first shaft is connected to the steering column shaft and the second shaft to the gearbox.
  • the torque sensor may be an integral part of the gearbox.
  • the two may share a common housing.
  • the gearbox may connect the steering column shaft to the road wheels of the vehicle.
  • the shaft 102 which is typically a two part telescopic shaft, is connected to the steering wheel 103 at one end and engages a gearbox 104 at the other end, down towards the feet of the driver.
  • the gearbox 104 is connected to a fixed part of the vehicle and a support bracket (not shown), located between the gearbox 104 and steering wheel 103, is secured to another fixed part of the vehicle such as the bulkhead (not shown).
  • the steering column shaft 102 is supported within the shroud by bearings that allow it to rotate as the driver turns the steering wheel.
  • the gearbox 104 includes a reduction gearset comprising a worm and wheel that connects the shaft to the rotor of an electric motor 105.
  • the gearbox 104 also connects the shaft to the road wheels 109 of the vehicle, usually through a rack and pinion assembly 117. As the steering column shaft rotates, the rack and pinion assembly 117 cause the wheels of the vehicle to turn.
  • the electric motor 105 is driven by a drive circuit 110 to apply a torque to the steering column shaft.
  • the motor 105 in this example is a three phase motor and the drive circuit 110 in this example comprises a bridge having an upper switch that connects a respective phase to a positive supply voltage and a lower switch, that when closed connects the phases to a negative supply voltage or ground. By opening and closing the switches in response to pulse width modulated drive signals, the current in the motor, and hence the torque, can be accurately controlled.
  • the PWM control signals for the drive circuit 110 are generated by a controller 108.
  • a torque sensor 107 is provided which measures the torque applied to the column shaft by the driver. This is located in the gearbox housing 106 on the input side of the gearbox 104, by which we mean the side that connects to the steering column shaft 102. As such the torque measured will be indicative of the torque applied to the column shaft 102 by the driver turning the steering wheel 103.
  • This torque measurement is fed into the controller 108 and used as the basis for producing a torque demand signal.
  • the controller 108 then converts this demand signal into appropriate PWM control signals for the motor 105.
  • An example of such a controller 107 is taught in the applicant's earlier patent application WO/2003/105329 .
  • the torque sensor 107 is shown in more detail in Figure 2 of the drawings.
  • the sensor 107 is a mechanical sensor that functions by measuring the angular deflection between a first shaft 102a and a second shaft 102b which are connected together by a torsion bar 116.
  • the sensor 107 is located inside the gearbox housing 106, with the first shaft 102a being coupled through a splined connection 111 to the worm and wheel gear, and the second shaft 102b through a splined coupling to the steering column shaft.
  • the torsion bar 116 is surrounded by a hollow sleeve 112 that is secured at a first position to the first shaft 102a and extends along the torsion bar 116 to at least partially axially overlap the second shaft 102b.
  • a first part of angular deflection indicating means 114 Connected to the overlapping end 113 of the sleeve 112 is a first part of angular deflection indicating means 114 whilst a second part 115 is connected to the second shaft 102b.
  • Many angular deflection indicating means are known in the art and any one may be used as part of the present invention. However inductive angular deflection indicating means are preferred.
  • the output of the angular deflection 114,115 means is a signal that represents the torque in the torsion bar 116.
  • a set of drive dogs 118a which in this example are in the form of two internal flats on diametrically opposed sides of the axis sleeve.
  • the second shaft 102b is provided with a set of corresponding drive dogs 118b in the form of flats on the outer surface of the shaft 102b that are also diametrically opposed.
  • the two pairs of flats 118a,118b are spaced apart so that they permit a defined range of angular deflection of the torsion bar 116 but will engage each other to provide a path for torque to be transferred from the first shaft 102a to the second shaft 102b in the event of a failure of the torsion bar 116.
  • the torque sensor 107 of the invention also includes a connecting element 119 which has a first part that is secured within a bore in one of the second shaft 102b and the sleeve 113.
  • the connecting element is a pin 119 having a second part that extends into a feature of the other of the second shaft 102b and the sleeve 112, at zero torque across the torque sensor 107 the pin 119 being spaced circumferentially from the feature by an angular distance greater than the spacing between the drive dogs 118a, 118b and spaced from the feature in a direction along the axis of the shafts 102a, 102b that is less than the overlap of the drive dogs 118a, 118b in that direction to prevent the input and output shafts 102a, 102b moving apart in the event of failure of the torsion bar 116 by an amount that would otherwise prevent the drive dogs 118a, 118b engaging.
  • Figures 4 to 19 show four alternative embodiments in more detail, each of which includes a different arrangement for the connecting element, the bore and the feature.
  • Figure 4 is a view in cross section in a plane containing the axis of the torque sensor 207 showing the location of a connecting element 219 in a first embodiment of a torque sensor 207 within the scope of the invention
  • Figure 5 is an enlarged view of the part of Figure 4 shown in a circle
  • Figure 6 is a perspective view of the part of the torque sensor 207 prior to assembly.
  • Figure 7 shows in perspective an end part of the sleeve 212 of the torque sensor 207.
  • a connecting element 219 in the form of an elongate metal pin with a generally uniform circular cross section, is press fitted into a bore 220 in the end of the sleeve 212 where it overlaps the second shaft 202b.
  • the bore 220 extends radially from the outer surface of the sleeve 212 right through the sleeve 212 towards the axis of the sleeve 212. Aligned with this bore 220 is a feature in the end of the second shaft 202b. This is also a bore 221, which extends towards the axis of the second shaft 202b, but of a larger diameter than the bore 220 in the sleeve 212. This means that the pin 219 is a loose fit in the bore 221.
  • the bores 220,221 are aligned when zero torque is applied to the torsion bar 216 so that the pin 219 does not contact the side wall of the bore 221 in the second shaft 202b, and when torsion is applied that causes the pin 219 to move sideways in the bore 221 in the second shaft 202b (as the sleeve rotates around the axis of the second shaft), the pin 219 will also not contact the sides because the drive dogs (male dog 218b shown) will engage before that happens. This ensures that the pin 219 does not carry any side load during normal use and the drive dogs (male dog 218b shown) can function correctly.
  • Figures 8 to 11 are views corresponding with those of Figures 4 to 7 for a second embodiment of a torque sensor within the scope of the invention.
  • This embodiment differs in that the connecting element 319 is press fitted into a bore 321 in the second shaft but loosely fits within a bore 320 in the sleeve 312 of the torque sensor 307.
  • Figure 8 is a view in cross section in a plane containing the axis of the torque sensor 307 showing the location of a connecting element 319 in a first embodiment of a torque sensor 307 within the scope of the invention
  • Figure 9 is an enlarged view of the part of Figure 8 shown in a circle.
  • Figure 10 is a perspective view of the part of the torque sensor 307 prior to assembly.
  • Figure 11 shows in perspective an end part of the sleeve 312 of the torque sensor 307.
  • a connecting element 319 in the form of an elongate metal pin with a generally uniform circular cross section, is press fitted into a bore 321 in the outer surface of the second shaft 302b in the end where it overlaps the sleeve 312.
  • Aligned with this bore 321 is a bore 320 in the sleeve 312 which extends radially from the outer surface of the sleeve 312 right through the sleeve 312 towards the axis of the sleeve 312, but this bore 320 is of a larger diameter than the bore 321 of the second shaft 302b.
  • This means that the pin 319 is a loose fit in the bore 220.
  • the bores 220,221 are aligned when zero torque is applied to the torsion bar 216 so that the pin 319 does not contact the side wall of the bore 320 in the sleeve 312, and when torsion is applied that causes the pin 319 to move sideways in the bore 320 in the sleeve 312 (as the sleeve rotates around the axis of the second shaft), the pin 319 will also not contact the sides because the drive dogs (male dog 318b shown) will engage before that happens. This ensures that the pin 319 does not carry any side load during normal use and the drive dogs (male dog 318b shown) can function correctly.
  • Figures 12 to 15 are views corresponding with those of Figures 4 to 7 for a third embodiment of a torque sensor within the scope of the invention.
  • one part of the connecting element is secured in a bore in the sleeve and another part that plunges into a feature in the form of a slot that extends linearly across a part of the circumference of the second shaft.
  • Figure 12 is a view in cross section in a plane containing the axis of the torque sensor 407 showing the location of a connecting element 419 in a first embodiment of a torque sensor 407 within the scope of the invention
  • Figure 13 is an enlarged view of the part of Figure 12 shown in a circle.
  • Figure 14 is a perspective view of the part of the torque sensor 407 prior to assembly.
  • Figure 15 shows in perspective an end part of the sleeve 412 of the torque sensor 407.
  • a connecting element 419 in the form of an elongate metal pin with a generally uniform circular cross section, is press fitted into a bore 420 in the end of the sleeve 412 where it overlaps the second shaft 402b.
  • the bore 420 extends radially from the outer surface of the sleeve 412 right through the sleeve 412 towards the axis of the sleeve 412. Aligned with this bore 420 is a feature in the end of the second shaft 402b. This feature is a slot 421 that extends linearly across a part of the circumference of the second shaft 402b.
  • This may be formed by drilling away part of the second shaft using a drill bit that extends perpendicular to the axis of the second shaft and is spaced radially away from the axis.
  • the pin 419 is a loose fit in the slot 421.
  • the bore 420 and slot 421 are aligned when zero torque is applied to the torsion bar 416 so that the pin 419 does not contact the slot 421 in the second shaft 402b, and when torsion is applied that causes the pin 419 to move sideways in the slot 421 in the second shaft 402b (as the sleeve rotates around the axis of the second shaft), the pin 419 will also not contact the slot 421 because the drive dog (male dog 418b shown) will engage before that happens. This ensures that the pin 419 does not carry any side load during normal use and the drive dogs (male dog 418b shown) can function correctly.
  • this arrangement can be inverted such that the pin is press fitted within the second shaft wherein the inner surface of the sleeve comprises a slot which contacts the pin only in the event of failure of the torsion bar.
  • Figures 16 to 19 are views corresponding with those of Figures 4 to 7 for a fourth embodiment of a torque sensor within the scope of the invention.
  • the second shaft comprises a slot is a curved, turned, groove rather than a linear slot.
  • the connecting element is press fitted into the sleeve and project loosely into the slot.
  • Figure 16 is a view in cross section in a plane containing the axis of the torque sensor 507 showing the location of a connecting element 519 in a first embodiment of a torque sensor 507 within the scope of the invention
  • Figure 517 is an enlarged view of the part of Figure 16 shown in a circle
  • Figure 18 is a perspective view of the part of the torque sensor 507 prior to assembly.
  • Figure 19 shows in perspective an end part of the sleeve 512 of the torque sensor 507.
  • a connecting element 519 in the form of an elongate metal pin with a generally uniform circular cross section, is press fitted into a bore 520 in the end of the sleeve 512 where it overlaps the second shaft 502b.
  • the bore 520 extends radially from the outer surface of the sleeve 512 right through the sleeve 512 towards the axis of the sleeve 512.
  • Aligned with this bore 520 is a feature in the end of the second shaft 502b. This feature is a slot 521 which is a curved, turned, groove rather than a linear slot.
  • the pin 519 is a loose fit in the slot 521.
  • the bore 520 and slot 521 are aligned when zero torque is applied to the torsion bar 516 so that the pin 519 does not contact the slot 521 in the second shaft 502b, and when torsion is applied that causes the pin 519 to move sideways in the slot 521 in the second shaft 502b (as the sleeve rotates around the axis of the second shaft), the pin 519 will also not contact the slot 521 because the drive dog (male dog 518b shown) will engage before that happens. This ensures that the pin 519 does not carry any side load during normal use and the drive dogs (male dog 518b shown) can function correctly.
  • this arrangement can be inverted such that the pin is press fitted within the second shaft, wherein the inner surface of the sleeve comprises a grooved slot which contacts the pin only in the event of failure of the torsion bar.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Power Steering Mechanism (AREA)

Claims (14)

  1. Drehmomentsensor (107; 207; 307; 407; 507) zur Verwendung in einem elektrischen Servolenksystem (101), das Folgendes umfasst:
    eine erste Welle (102a), eine zweite Welle (102b; 202b; 302b; 402b; 502b) und einen Torsionsstab (116; 216; 316; 416; 516), der die erste Welle (102a) mit der zweiten Welle (102b; 202b; 302b; 402b; 502b) verbindet,
    eine hohle Hülse (112; 212; 312; 412; 512), die an einem ersten Teil an der ersten Welle (102a) gesichert ist und sich entlang des Torsionsstabs (116; 216; 316; 416; 516) erstreckt, um die zweite Welle (102b; 202b; 302b; 402b; 502b) zumindest teilweise axial zu überlappen,
    Winkelauslenkungsanzeigemittel, die ein Signal produzieren, das von der Winkelauslenkung der ersten Welle (102a) relativ zur zweiten Welle (102b; 202b; 302b; 402b; 502b) abhängt, wenn ein Drehmoment über dem Drehmomentsensor (107; 207; 307; 407; 507) angewendet wird, das den Torsionsstab (116; 216; 316; 416; 516) veranlasst, sich zu verdrehen,
    zumindest einen Mitnehmer (118a), befestigt an der Hülse (112; 212; 312; 412; 512) und zumindest einen entsprechenden Mitnehmer (118b; 218b; 318b; 418b; 518b), befestigt an der zweiten Welle (102b; 202b; 302b; 402b; 502b), wobei im normalen Betrieb die zwei Mitnehmer (118a, 118b; 218b; 318b; 418b; 518b) versetzt sind, sodass sie einen definierten Bereich von Winkelauslenkung des Torsionsstabs (116; 216; 316; 416; 516) erlauben, aber miteinander in Eingriff kommen, um einen Pfad für Drehmoment bereitzustellen, das bei einem Fehler des Torsionsstabes (116; 216; 316; 416; 516) von der ersten Welle (102a) auf die zweite Welle (102b; 202b; 302b; 402b; 502b) zu übertragen ist, und
    dadurch gekennzeichnet, dass es ferner ein Verbindungselement (119; 219; 319; 419; 519), das einen ersten Teil aufweist, der innerhalb einer Bohrung (220; 320; 420; 520) gesichert ist, in einer aus der zweiten Welle (102b; 202b; 302b; 402b; 502b) und der Hülse (112; 212; 312; 412; 512) umfasst; wobei das Verbindungselement (119; 219; 319; 419; 519) einen zweiten Teil aufweist, der sich in ein Merkmal der anderen aus der zweiten Welle (102b; 202b; 302b; 402b; 502b) und der Hülse (112; 212; 312; 412; 512) erstreckt, wobei bei null Drehmoment über dem Drehmomentsensor (107; 207; 307; 407; 507) das Verbindungselement (119; 219; 319; 419; 519) von dem Merkmal in einer Richtung entlang der Achse der Wellen beabstandet ist, die kleiner als die Überlappung der Mitnehmer (118a, 118b; 218b; 318b; 418b; 518b) in dieser Richtung ist, um zu verhindern, dass sich die Wellen (102a, 102b; 202b; 302b; 402b; 502b) bei einem Fehler des Torsionsstabs (116; 216; 316; 416; 516) um einen Betrag voneinander weg bewegen, der andernfalls verhindern würde, dass die Mitnehmer (118a, 118b; 218b; 318b; 418b; 518b) in Eingriff kommen, und wobei das Verbindungselement (119; 219; 319; 419; 519) und das Merkmal so angeordnet sind, dass das Verbindungselement (119; 219; 319; 419; 519) nicht mit dem Merkmal in Kontakt kommt als ein Ergebnis von Drehung des ersten Teils relativ zum zweiten Teil.
  2. Drehmomentsensor (107; 207; 307; 407; 507) nach Anspruch 1, wobei das Verbindungselement (119; 219; 319; 419; 519) einen Stift umfasst.
  3. Drehmomentsensor (107; 207; 307; 407; 507) nach Ansprüchen 1 oder 2, wobei das Verbindungselement (119; 219; 319; 419; 519) ein längliches Element umfasst, das einen im Allgemeinen kreisrunden Querschnitt entlang seiner gesamten oder eines größten Teils seiner Länge aufweist.
  4. Drehmomentsensor (107; 207; 307; 407; 507) nach Ansprüchen 1 oder 2, wobei das Verbindungselement (119; 219; 319; 419; 519) eine oder mehrere umlaufende Nuten an beabstandeten Positionen entlang seiner Länge umfasst, die das Verbindungselement (119; 219; 319; 419; 519) beim Halten an der Bohrung, in der es befestigt ist, unterstützen.
  5. Drehmomentsensor (207; 307) nach einem der vorhergehenden Ansprüche, wobei das Merkmal, in das das Verbindungselement (219; 319) hereinragt, eine überdimensionierte Bohrung (221; 321) umfasst, in die sich ein Teil des Verbindungselements (219; 319) erstreckt.
  6. Drehmomentsensor (407; 507) nach einem der Ansprüche 1 bis 4, wobei das Merkmal einen Schlitz (421; 421) umfasst, der sich tangential über eine äußere Fläche der Hülse (412; 512) oder eine innere Fläche der zweiten Welle (402b; 502b) erstreckt.
  7. Drehmomentsensor (107; 207; 307; 407; 507) nach einem der vorhergehenden Ansprüche, wobei das Verbindungselement (119; 219; 319; 419; 519) eine Presspassung in der Bohrung (220; 320; 420; 520) aufweist, in der es gesichert ist, wie etwa eine Übermaßpassung.
  8. Drehmomentsensor (207) nach einem der vorhergehenden Ansprüche, wobei ein Teil des Verbindungselements (219) in einer Bohrung (220) in der Hülse gesichert ist, und ein anderer Teil in ein Merkmal in der Form einer überdimensionierten Bohrung (221) in der zweiten Welle (202b) eintaucht.
  9. Drehmomentsensor (307) nach einem der Ansprüche 1 bis 7, wobei das Verbindungselement (319) eine Presspassung in einer Bohrung (321) in der zweiten Welle (302b) aufweist und ein Teil des Verbindungselements (319) innerhalb einer überdimensionierten Bohrung (320) in der Hülse (312) befindlich sein kann.
  10. Drehmomentsensor (407) nach einem der Ansprüche 1 bis 7, wobei ein Teil des Verbindungselements (419) in einer Bohrung (420) in der Hülse (412) gesichert ist und ein anderer Teil in ein Merkmal in der Form eines Schlitzes (421) eintaucht, der sich linear über einen Teil des Umfangs der zweiten Welle (402b) erstreckt.
  11. Drehmomentsensor (507) nach einem der Ansprüche 1 bis 7, wobei ein Teil des Verbindungselements (519) in einer Bohrung (520) in der Hülse (512) gesichert ist und ein anderer Teil in ein Merkmal in der Form eines Schlitzes (521) eintaucht, wobei die Basis des Schlitzes (521) eine gekrümmte, gebogene Nut anstelle eines linearen Schlitzes ist.
  12. Drehmomentsensor nach einem der vorhergehenden Ansprüche, wobei die Mitnehmer (118a, 118b; 218b; 318b; 418b; 518b) Abflachungen, die in der äußeren Fläche der zweiten Welle ausgebildet sind, und Abflachungen, die in der inneren Fläche der Hülse (112; 212; 312; 412; 512) ausgebildet sind, umfassen, wobei die Abflachungen in der Ruheposition zueinander zeigen aber voneinander beabstandet sind, und wobei, wenn ein übermäßiges Drehmoment angewendet wird, die Abflachungen in Kontakt kommen, um übermäßige relative Drehung zu verhindern.
  13. Drehmomentsensor (107; 207; 307; 407; 507) nach Anspruch 1 bis 12, wobei es mehrere Mitnehmer (118a), die mit der Hülse (112; 212; 312; 412; 512) verknüpft sind, und mehrere Mitnehmer (118b; 218b; 318b; 418b; 518b), die mit der zweiten Welle (102b; 302b; 402b; 502b) verknüpft sind, gibt, die als Zähne angeordnet sind, die rund um den Umfang der Hülse (112; 212; 312; 412; 512) und der zweiten Welle (102b; 302b; 402b; 502b) beabstandet sind.
  14. Elektrisches Servolenksystem, umfassend eine Lenksäulenwelle, ein Getriebe, einen Elektromotor, der über das Getriebe mit der Lenksäulenwelle verbunden ist, einen Drehmomentsensor (107; 207; 307; 407; 507) nach einem der Ansprüche 1 bis 13, sodass eine aus der ersten und der zweiten Welle des Drehmomentsensors (107; 207; 307; 407; 507) mit dem Getriebe und die andere mit der Lenksäulenwelle verbunden ist, und eine Verarbeitungsschaltung, die den Ausgang des Drehmomentsensors (107; 207; 307; 407; 507) empfängt und von diesem Ausgang ein Drehmomentanforderungssignal ableitet, das indikativ für ein Unterstützungsdrehmoment ist, das über das Getriebe durch den Elektromotor anzuwenden ist, wobei das Unterstützungsdrehmoment im gleichen Sinne wirkt, wie das vom Fahrer angewendete Drehmoment, um die zum Betreiben der Lenkung nötige Anstrengung zu verringern.
EP16701847.2A 2015-01-19 2016-01-19 Verbesserungen an drehmomentsensoren Active EP3247985B1 (de)

Applications Claiming Priority (2)

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GBGB1500876.6A GB201500876D0 (en) 2015-01-19 2015-01-19 Improvements in torque sensors
PCT/GB2016/050111 WO2016116742A1 (en) 2015-01-19 2016-01-19 Improvements in torque sensors

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EP3247985B1 true EP3247985B1 (de) 2020-05-27

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JP6514295B2 (ja) * 2017-10-02 2019-05-15 株式会社ショーワ 故障検出装置、電動パワーステアリング装置
GB201806096D0 (en) * 2018-04-13 2018-05-30 Trw Ltd Torsion bar assembly and method of assembling same
WO2022059295A1 (ja) 2020-09-16 2022-03-24 日本精工株式会社 トルク測定装置
US11820439B2 (en) * 2020-12-16 2023-11-21 Steering Solutions Ip Holding Corporation Power-assist assembly
CN114750915B (zh) * 2021-01-11 2025-08-08 中国船舶集团有限公司第七一一研究所 一种可调角度串列式螺旋桨的新型反馈装置

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JPS6138532U (ja) 1984-08-13 1986-03-11 日産自動車株式会社 トルク検出器
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EP1707932B1 (de) * 2003-03-27 2008-04-30 Toyoda Koki Kabushiki Kaisha Drehmomentsensor und damit ausgestattete elektrische Lenkvorrichtung
JP2005219573A (ja) * 2004-02-04 2005-08-18 Denso Corp 車両の電動パワーステアリング制御装置
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US8984962B2 (en) * 2013-03-15 2015-03-24 H. Aaron Christmann Rotatable torque-measuring apparatus and method
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CN107406102A (zh) 2017-11-28
GB201500876D0 (en) 2015-03-04
KR20170126859A (ko) 2017-11-20
US20180010971A1 (en) 2018-01-11
EP3247985A1 (de) 2017-11-29
US10323994B2 (en) 2019-06-18
WO2016116742A1 (en) 2016-07-28
CN107406102B (zh) 2020-03-10

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